Forget GPU sniffer. Adding the card to the text file is all you need do.
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For Premiere Pro CC as long as the card has 1GB of VRAM you'll be able to enable GPU Mercury Playback. If under 1GB even modifying the text file will not work.
What kind of GPU do you have?
Thank you this solved the problem, at first I was unable to modify the .txt file but I changed the settings of the .txt file to read&write and added my GPU now all is working well. Thank you for the assistance Jim!